The three-dimensional (3D) structures of pores directly affect the CH₄ flow. Therefore, it is very important to analyze the 3D spatial structure of pores and to simulate the CH₄ flow with the connected pores as the carrier. The result shows that the equivalent radius of pores and throats are 1–16 μm and 1.03–8.9 μm, respectively, and the throat length is 3.28–231.25 μm. The coordination number of pores concentrates around three, and the intersection point between the connectivity function and the X-axis is 3–4 μm, which indicate the macro-pores have good connectivity. During the single-channel flow, the pressure decreases along the direction of CH₄ flow, and the flow velocity of CH₄ decreases from the pore center to the wall. Under the dual-channel and the multi-channel flows, the pressure also decreases along the CH₄ flow direction, while the velocity increases. The mean flow pressure gradually decreases with the increase of the distance from the inlet slice. The change of mean flow pressure is relatively stable in the direction horizontal to the bedding plane, while it is relatively large in the direction perpendicular to the bedding plane. The mean flow velocity in the direction horizontal to the bedding plane (Y-axis) is the largest, followed by that in the direction horizontal to the bedding plane (X-axis), and the mean flow velocity in the direction perpendicular to the bedding plane is the smallest.

中文翻译：

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基于X射线μ-CT扫描数据的无烟煤大孔三维空间结构及流动模拟

孔的三维（3D）结构直接影响CH ₄流量。因此，分析孔的3D空间结构并模拟以连通孔为载体的CH ₄流动非常重要。结果表明，孔和喉的等效半径分别为1–16μm和1.03–8.9μm，喉长为3.28–231.25μm。孔的配位数集中在3附近，连通性函数与X轴的交点为3-4μm，表明大孔具有良好的连通性。在单信道流，压力沿着CH的方向减小₄流，和CH的流速₄从孔的中心到壁逐渐减小。在双通道和多通道流动下，压力也沿CH ₄流动方向减小，而速度增加。平均流量压力随着距入口切片的距离的增加而逐渐减小。平均流动压力的变化在垂直于铺垫平面的方向上相对稳定，而在垂直于铺垫平面的方向上相对较大。垂直于层理平面的方向（Y轴）的平均流速最大，其次是垂直于层理平面的方向（X轴）的流速，以及垂直于层理方向的平均流速。飞机是最小的。